Anisotropic sub-Doppler laser cooling in dysprosium magneto-optical traps
arXiv:1007.3245 · doi:10.1103/PhysRevA.82.043403
Abstract
Magneto-optical traps (MOTs) of Er and Dy have recently been shown to exhibit population-wide sub-Doppler cooling due to their near degeneracy of excited and ground state Lande g factors. We discuss here an additional, unusual intra-MOT sub-Doppler cooling mechanism that appears when the total Dy MOT cooling laser intensity and magnetic quadrupole gradient increase beyond critical values. Specifically, anisotropically sub-Doppler-cooled cores appear, and their orientation with respect to the quadrupole axis flips at a critical ratio of the MOT laser intensity along the quadrupole axis versus that in the plane of symmetry. This phenomenon can be traced to a loss of the velocity-selective resonance at zero velocity in the cooling force along directions in which the atomic polarization is oriented by the quadrupole field. We present data characterizing this anisotropic laser cooling phenomenon and discuss a qualitative model for its origin based on the extraordinarily large Dy magnetic moment and Dy's near degenerate g factors.
4 pages, 5 figures
References in corpus (11)
- The physics of dipolar bosonic quantum gases
- Trapping ultracold dysprosium: a highly magnetic gas for dipolar physics
- Novel quantum phases of dipolar Bose gases in optical lattices
- Scaling the neutral atom Rydberg gate quantum computer by collective encoding in Holmium atoms
- Biaxial nematic phases in ultracold dipolar Fermi gases
- Ferro-Nematic ground state of the dilute dipolar Fermi gas
- Dynamical properties of dipolar Fermi gases
- Zero Sound in Dipolar Fermi Gases
- Sub-Doppler laser cooling and magnetic trapping of erbium
- Spin textures in condensates with large dipole moments
- Unconventional magnetism in imbalanced Fermi systems with magnetic dipolar interactions
Cited by in corpus (11)
- Dipolar physics: A review of experiments with magnetic quantum gases
- Dysprosium magneto-optical traps
- Magneto-Optical Trapping of Holmium Atoms
- Spectroscopy of a narrow-line laser cooling transition in atomic dysprosium
- Anisotropic optical trapping of ultracold erbium atoms
- Optical cooling and trapping of highly magnetic atoms: The benefits of a spontaneous spin polarization
- Dynamic polarizabilities and magic wavelengths for dysprosium
- Two-temperature momentum distribution in a Thulium magneto-optical trap
- Systematic optimization of laser cooling of dysprosium
- A Magneto-Optical Trap of Titanium Atoms
- Sub-Doppler cooling of bosonic strontium in a two-color MOT